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Title: Bonding properties of FCC-like Au 44 (SR) 28 clusters from X-ray absorption spectroscopy

Abstract

Thiolate-protected gold clusters with precisely controlled atomic composition have recently emerged as promising candidates for a variety of applications because of their unique optical, electronic, and catalytic properties. The recent discovery of the Au44(SR)28 total structure is considered as an interesting finding in terms of the face-centered cubic (FCC)-like core structure in small gold-thiolate clusters. Herein, the unique bonding properties of Au44(SR)28 is analyzed using temperature-dependent X-ray absorption spectroscopy (XAS) measurements at the Au L3-edge and compared with other FCC-like clusters such as Au36(SR)24 and Au28(SR)20. A negative thermal expansion was detected for the Au–Au bonds of the metal core (the first Au–Au shell) and was interpreted based on the unique Au core structure consisting of the Au4 units. EXAFS fitting results from Au28(SR)20, Au36(SR)24, and Au44(SR)28 show a size-dependent negative thermal expansion behavior in the first Au–Au shell, further highlighting the importance of the Au4 units in determining the Au core bonding properties and shedding light on the growth mechanism of these FCC-like Au clusters.

Authors:
 [1];  [1];  [2];  [2];  [1]
  1. Department of Chemistry, Dalhousie University, Halifax, NS B3H 4R2, Canada.
  2. Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
FOREIGN
OSTI Identifier:
1408140
Resource Type:
Journal Article
Resource Relation:
Journal Name: Canadian Journal of Chemistry; Journal Volume: 95; Journal Issue: 11
Country of Publication:
United States
Language:
ENGLISH
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Yang, Rui, Chevrier, Daniel M., Zeng, Chenjie, Jin, Rongchao, and Zhang, Peng. Bonding properties of FCC-like Au 44 (SR) 28 clusters from X-ray absorption spectroscopy. United States: N. p., 2017. Web. doi:10.1139/cjc-2017-0169.
Yang, Rui, Chevrier, Daniel M., Zeng, Chenjie, Jin, Rongchao, & Zhang, Peng. Bonding properties of FCC-like Au 44 (SR) 28 clusters from X-ray absorption spectroscopy. United States. doi:10.1139/cjc-2017-0169.
Yang, Rui, Chevrier, Daniel M., Zeng, Chenjie, Jin, Rongchao, and Zhang, Peng. Wed . "Bonding properties of FCC-like Au 44 (SR) 28 clusters from X-ray absorption spectroscopy". United States. doi:10.1139/cjc-2017-0169.
@article{osti_1408140,
title = {Bonding properties of FCC-like Au 44 (SR) 28 clusters from X-ray absorption spectroscopy},
author = {Yang, Rui and Chevrier, Daniel M. and Zeng, Chenjie and Jin, Rongchao and Zhang, Peng},
abstractNote = {Thiolate-protected gold clusters with precisely controlled atomic composition have recently emerged as promising candidates for a variety of applications because of their unique optical, electronic, and catalytic properties. The recent discovery of the Au44(SR)28 total structure is considered as an interesting finding in terms of the face-centered cubic (FCC)-like core structure in small gold-thiolate clusters. Herein, the unique bonding properties of Au44(SR)28 is analyzed using temperature-dependent X-ray absorption spectroscopy (XAS) measurements at the Au L3-edge and compared with other FCC-like clusters such as Au36(SR)24 and Au28(SR)20. A negative thermal expansion was detected for the Au–Au bonds of the metal core (the first Au–Au shell) and was interpreted based on the unique Au core structure consisting of the Au4 units. EXAFS fitting results from Au28(SR)20, Au36(SR)24, and Au44(SR)28 show a size-dependent negative thermal expansion behavior in the first Au–Au shell, further highlighting the importance of the Au4 units in determining the Au core bonding properties and shedding light on the growth mechanism of these FCC-like Au clusters.},
doi = {10.1139/cjc-2017-0169},
journal = {Canadian Journal of Chemistry},
number = 11,
volume = 95,
place = {United States},
year = {Wed Nov 01 00:00:00 EDT 2017},
month = {Wed Nov 01 00:00:00 EDT 2017}
}